Television apparatus



Aug. 16, 194-9. D. JACKSON TELEVISION APPARATUS Filed July 28, 1947 Inventor M47 1 (Mm; Atlor ney Patented Aug. 16, 1949 rtm lsion Armmrus Donald Jackson, Cambridge, England, assignor to eye Limited, Cambridge, England, a. British company Application July 2?}, 1947 SerialNo. 164,157

' Great Britain Ma 1939.

Section 1;, Public Law 690, August 8, 1946. Patent expir M r 1;, L959.

9 C ai s, 1

The present invention relates to television recarer d more pat eu e he an mp e method at mountin and su po i the f s oil: cithe cathode, Wilma o nab it lobe adjusted so that the raster may a ssumethe cor--. rest os t o Accordin to.v t e. pres nt ven on. h foc coil isv carriedi p. a. e mbal fitt 9 t a a be turned tothe desired, inclination whilst, in addition, at least one of? the? pivot is. adju table longitudinally of; the. cathode ray tube in the. gimbal holder, means being provided for looking it in. any. desired; adjusted; position.

An. embodiment of; the invention, will b described with-referenceto-theaccompanying drawings wherein Figs. 1, 2: and. 3; are. respectively,- an end elevation, a, sideelevation and aplan oi a coil mount ing, and;

Fig. 4 is a diagrammatic side. View of the coil mounting with a' cathode ray tube in, position.

Referring to the drawing the coil is enclosed in a casing l which has two trunnions 2 and 3 by which it is supported as a g-imbal in a U- shaped cradle 4,, The, cradle .has a, rubber bush 5 to receive a cathode ray tube, 6-,, which also passes through, an, aperture in the coil casing. The trunnion'2 is screw-threaded to receive a wing nut l and a washer L21. It passes through an open ended slot 8;in.0ne.1imb,of the-cradle d... through a. hole. in. a. platev eat. The: plate and the cradle 4 have respective lugs l4- and IS, the lugs l5 being provided with screws l6 by means of which the plate and the trunnion 2 may be finely adjusted in the lateral direction as is indicated by the double ended arrow I! in Fig. 3, the slot 8 having sufficient width to permit this movement of the trunnion Within it. The other trunnion passes loosely into a hole 9 in the other limb of the cradle. The casing l and therefore the enclosed coil can be turned about the axis of the trunnions 2 and 3 in the manner indicated by the double headed arrow 19 in Fig. 3. It can also be tilted, as is shown by the double ended arrow [9 in Fig. 2, by moving the trunnion 2 along its slot 8, a movement which is permitted by the clearance between the trunnion 3 and its bearing hole 9. The wing nut 1 enables the coil to be locked in position after adjustment and clamps the plate l3 to the cradle 4. The screws I 6 may also, if desired, serve as additional clamping means for the plate l3. Screws l0, passing through one wall of the cradle and adapted to bear on the coil case I, may be employed to obtain fine d s me t of, e an ular o it o f coil and. to hold it against vibration when adjusted.

The trunnion 3 is preferably. tubular and serves as a convenient lead-in for the conducting, wires Ll. of. the coil. The inclination of the bottomlimb of the cradle and the open ended form of the slot 8 enable the coil to be; easily inserted in the cradle when the trunnions are permanently secured to thecoil. case. i

In an arrangement in which lateral adjustment of the coil, is not required, theplate 1.3 may be omitted and the slot 8.thenmade-n arrow enough to afford guidance for the trunnion 2. g

It will be understood thatyariousmodifications may be made without departing from the scope of the. invention as. defined by the appended claims.

The cradle may be arranged: so that the tr un-. nionaxisis vertical, horizontal or inclined at any, desired angle. When the arrangementis such that the axis isvertical the bearing for one trunnion maybeprovidedin the chassis. The cradle maybe stampedup from the metal of whicnthe chassis ismade. Instead of the trunnion 3 being journal-led in, a hole itmay have. ahemispherical or other shaped end located in a depressionv in the cradle, or chassis, or its end maybehollow andsupported on a cone or other; centre. Ina stead of mounting the-coil-in the casing! it may bemounted in a. ring to which the trunnions 2. and 3 are secured or the eon-may beprovided with pivots in any other manner so that it may be adjusted as hereinbefore described. In this case the screws ID, if provided, would bear on the coil itself,

If desired the trunnion 2 may be movable longitudinally of the tube in a closely fitting slot in a plate which is mounted on the cradle so as to be adjustable transversely of the tube.

I claim:

1. Apparatus comprising a magnetic focussing device having a central aperture for surrounding a cathode ray tube, two supporting trunnions extending in diametrically opposite directions from the focussing device, supporting members cooperating with each of said trunnons and permitting the trunnions to turn therein, means for adjusting at least one of said trunnions relative to its supporting member in a direction substantially parallel to the axis of the aperture in the focussing device, and means for locking the focussing device in any desired adjusted position.

2. Apparatus as claimed in claim 1, wherein justing one of said trunnions relative to its sup-v porting member both laterally and longitudinally with respect to the axis of the focussing device, and a single locking means for securing the focussing device in its adjusted position to hold the focussing device against turning and longitudinal and lateral movement.

4. Apparatus comprising a magnetic focussing device having a central aperture for surrounding a cathode ray tube, two supporting trunnions extending in diametrically opposite directions from the focussing device, a first supporting member having an aperture into which fits one of the trunnions, a second supporting member having a slot within which the second trunnion is slidably mounted, the width of said slot being greater than'the diameter of said second trunnion, a plate having an aperture through which said second trunnion passes, said plate being laterally movable relative to the second supporting member, and means for locking the plate and focussing device in an adjusted position.

5. Apparatus comprising a magnetic iocussing device having a central aperture for surround ing a cathode ray tube, two supporting trunnions extending in diametrically opposite directions from the focussing device, a U-shaped cradle member having an aperture in one of its limbs into which fits one of the trunnions and the slot in the other of its limbs within which the second trunnion is slidably mounted, the width of said slot being greater than the diameter of said second trunnion, a plate having an aperture through which said second trunnion passes, said plate bein laterally movable relative to the slotted limb, a screw thread on said second trunnion and a nut on said screw thread which is adapted to lock the plate and trunnion in the adjusted position on the slotted limb when it is tightened.

6. Apparatus comprising a magnetic focussing device having a central aperture for surrounding a cathode ray tube, two supporting trunnions extending in diametrically opposite directions from the focussing device, a first supporting member having a bearing into which fits one of the trunnions, a second supporting member having 7 a slot within which the second trunnion is slidably mounted, a screw thread on said second trunnion, and a nut on said screw thread which is adapted to lock the focussing device in the adjusted position when it is tightened.

7. Apparatus comprisin a magnetic focussing device having a central aperture for surrounding a cathode ray tube, two supporting trunnions extending in diametrically opposite directions from the focussing device, a first supporting member having a bearing into which fits one of the trunnions, a second supporting member carrying a plate having an aperture through which the second trunnion passes, said plate being movable both laterally and longitudinally relative to said second supporting member, and means for locking the plate and trunnions in an adjusted position.

8. Apparatus as claimed in claim '7, wherein screw means are provided which act between the plate and the second supportin member for adjusting their relative positions.

9. Apparatus comprising a magnetic focussing device having a central aperture for surrounding a cathode ray tube, two supporting trunnions extending in diametrically opposite directions from the focusing device, a first supporting member having a bearin into which fits one of the trunnions, a second supporting member having a slot within which the second trunnion is slidably mounted, screws engaging with the focussing device for adjusting its position relative to the supporting members, and means for locking the focussing device in an adjusted position.

DONALD JACKSON.

REFERENCES CITED The following references are of record in the file of this patent:

FOREIGN PATENTS Great Britain July 15, 1940 

